Process of impregnating artificial and natural materials.



ice-e5. XR 1.238.202 Ex; Exammer Cross Reference UNITED STATES PATENT OFFICE.

i IBOTHO SGHWERIN, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO ELEKTRO- OSMOSE AKTIENGESELLSCHAFT (GRAF SCHWEBIN GESELLSCHAF'I), OF FRANK- y FORT-ON-THE MAIN, GERMANY, A CORPORATION.

PROCESS OF IMPREGNATING ARTIFIGIAL AND NATURAL MATERIALS.

' 1,238,202.: I specification of Letters Patent- Patented Aug. 28, 1917. 1 Io Drawing. Application fled August 23, 1916. Serial No. 118,490.

To all. whom it may comer-n! This invention may also be applied for Be it known that I, BOTHO SCHWERIN, impregnating other materials, such as wood, a subject of the German Em eror, residing straw, fibrous material of all kinds, textile j at Frankfort-on-the-Main, ermany, Wilgoods, bandage material. For fibrous matei 'he1mstr. 34, have invented certain new and rial, textile oods or the like the process also 'useful Improvements in Processes of Improvides a finish or dre'ssin which is par- "pregnatinglArtificial and Natural Materials, ticularl suitable for absor in basic dyeof which t e following is a specification. stufls. 11 many cases it is desira le to render Attemptshave been made to harden natfibrous material capable of resistin heat. 40 o ural or artificial stones, cements, or the like This property is furnished bit-1h?- mafia by means of compounds of siliclc acid such in surprisin degree. a

as sodium or potamium silicate (waterglass). -Having t us described the nature of the the artificial. stone, cement, etc. consaid invention and the best means I know of tains lime or similarbasic binders the effect carrying the same into practical efiect, I 45 15 of treatifig it with sodium silicate is to roclaim duce insoluble calcium silicate and to H r- 1. The herein described process of treatate caustic soda. A portion of the liberated ing artificial or natural materials, com riscaustic soda may dissolve some of the silicic ing saturating the material .with solub e or acid or by the action of the air be changed dissolved silicic acid. 50 30 into sodium carbonate. In both cases the 2. The herein described process of treating soluble substances produced have the d1sad-' artificial or natural materials, comprising vanta e that they eflloresce and in doing so saturatin the. material with soluble or dismaiy estroy the stone. solved sihcic acid :free from electrolytes.

y the resent invention these faults can In testimony whereof I aflix my signature 55 It be avoide by saturat' the stone or the like in presence of two witnesses:

with soluble or dissolve silicic acid. Especially advantageous ior this purpose BOTHO SCHWERIN Q is the silicic acid obtained electro-osmoticall Witnesses: I as described in U. S. Letters Patent 1,132 9 Hmnr Hasm, g 5

30 this silicic acid being completely m Am F. Jn'nmcs. 

